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Related Experiment Video

Updated: Apr 12, 2026

Comprehensive DNA Methylation Analysis Using a Methyl-CpG-binding Domain Capture-based Method in Chronic Lymphocytic Leukemia Patients
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p53-dependent non-coding RNA networks in chronic lymphocytic leukemia.

C J Blume1, A Hotz-Wagenblatt2, J Hüllein1

  • 1Department of Translational Oncology, National Center for Tumor Diseases (NCT) and German Cancer Research Center (DKFZ), Heidelberg, Germany.

Leukemia
|May 15, 2015
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Mutant p53 impairs DNA damage response in chronic lymphocytic leukemia (CLL). This study identifies novel non-coding RNAs, including NEAT1 and lincRNA-p21, regulated by functional p53 in CLL cells, offering new therapeutic targets.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Mutations in the tumor suppressor p53 are linked to chemotherapy resistance and poor outcomes in chronic lymphocytic leukemia (CLL).
  • While p53 targets are known, a complete understanding of non-coding RNA targets affected by p53 dysfunction in CLL is lacking.
  • Assessing these non-coding RNAs is crucial for understanding p53's role in DNA damage response and developing targeted therapies.

Purpose of the Study:

  • To comprehensively map p53-dependent non-coding RNA targets in CLL using small RNA sequencing.
  • To identify novel microRNAs (miRNAs) and long non-coding RNAs (lncRNAs) regulated by p53 in response to DNA damage.
  • To investigate the role of identified lncRNAs (NEAT1, lincRNA-p21) in p53-mediated DNA damage response and cell death.

Main Methods:

  • Small RNA sequencing was employed to profile non-coding RNAs in CLL cells with varying p53 status.
  • Bioinformatic analysis was used to identify p53-dependent miRNAs and lncRNAs.
  • Isogenic lymphoma cell line models were utilized to confirm the p53 dependence of NEAT1 and lincRNA-p21 induction.

Main Results:

  • The study characterized the landscape of p53-dependent non-coding RNAs induced by DNA damage in CLL.
  • Beyond the known miR-34a, several miRNAs (miR-182-5p, miR-7-5p, miR-320c/d) were identified as p53 targets.
  • The lncRNAs NEAT1 and lincRNA-p21 were found to be induced by DNA damage in a p53-dependent manner and their induction correlated with cell death.

Conclusions:

  • This research elucidates the p53-dependent miRNome in CLL and identifies NEAT1 and lincRNA-p21 as novel components of the p53-mediated DNA damage response.
  • These findings highlight the potential of targeting these non-coding RNAs in CLL and lymphoma treatment strategies.
  • Understanding the p53-non-coding RNA axis provides new insights into chemoresistance mechanisms and therapeutic avenues in CLL.